Diabetic patients fasting blood glucose 3.8mmol/l is hypoglycemia, normal people 3.8mmol/l is not hypoglycemia, less than 2.8mmol/l is hypoglycemia. Normal people fasting blood sugar reaches 3.8mmol/l, most people do not have any symptoms, no special treatment, pay attention to regular meals on time. Diabetic patients with blood sugar 3.8mmol/l, most people have symptoms of hypoglycemia, such as panic, hand tremors, cold sweat, but some of the elderly do not have symptoms of hypoglycemia. Diabetic patients with fasting blood sugar 3.8mmol/l, control is too low, fasting can be controlled at 7mmol/l, two hours after the meal blood sugar control at 8~10mmol/l. Diabetic patients with fasting blood glucose 3.8mmol/l, need to intervene under the guidance of the doctor to deal with, to avoid accidents after the occurrence of hypoglycemic reaction.